/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pig.pigpen.editor.policies;

import org.apache.pig.pigpen.editor.commands.ResetOperatorTextCommand;
import org.apache.pig.pigpen.editor.editparts.OperatorEditPart;
import org.apache.pig.pigpen.editor.model.Operator;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.editpolicies.DirectEditPolicy;
import org.eclipse.gef.requests.DirectEditRequest;
import org.eclipse.jface.viewers.CellEditor;

/*
 * Adapted from code by Phil Zoio at http://www.eclipse.org/articles/Article-GEF-editor/gef-schema-editor.html
 */
public class OperatorDirectEditPolicy extends DirectEditPolicy {

    private String oldValue;

    protected Command getDirectEditCommand(DirectEditRequest request) {
        ResetOperatorTextCommand cmd = new ResetOperatorTextCommand();
        Operator operator = (Operator) getHost().getModel();
        cmd.setSource(operator);
        cmd.setOldText(operator.getText());
        CellEditor cellEditor = request.getCellEditor();
        cmd.setText((String) cellEditor.getValue());
        return cmd;
    }

    protected void showCurrentEditValue(DirectEditRequest request) {
        String value = (String) request.getCellEditor().getValue();
        OperatorEditPart operatorPart = (OperatorEditPart) getHost();
        operatorPart.handleTextChange(value);
    }

    protected void storeOldEditValue(DirectEditRequest request) {
        CellEditor cellEditor = request.getCellEditor();
        oldValue = (String) cellEditor.getValue();
    }

    protected void revertOldEditValue(DirectEditRequest request) {
        CellEditor cellEditor = request.getCellEditor();
        cellEditor.setValue(oldValue);
        OperatorEditPart opPart = (OperatorEditPart) getHost();
        opPart.revertTextChange(oldValue);
    }

}
